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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id s11-20020a170906354b00b00992bea2e9d2sm7027620eja.62.2023.08.30.03.36.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Aug 2023 03:36:27 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: Guenter Roeck , Jean Delvare , krzysztof.kozlowski+dt@linaro.org, Rob Herring , Conor Dooley , Naresh Solanki Cc: linux-hwmon@vger.kernel.org, Patrick Rudolph , Naresh Solanki , Rob Herring , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 1/3] dt-bindings: hwmon: Add Infineon TDA38640 Date: Wed, 30 Aug 2023 12:36:16 +0200 Message-ID: <20230830103620.3611761-1-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1775680852224343166 X-GMAIL-MSGID: 1775682914367340870 From: Patrick Rudolph Add the DT property 'infineon,en-pin-fixed-level' to indicated that the chip ENABLE pin is at fixed level or left unconnected(has internal pull-down). Signed-off-by: Patrick Rudolph Signed-off-by: Naresh Solanki ---- Changes in V4: - Update property name & description. - Update commit message. --- .../hwmon/pmbus/infineon,tda38640.yaml | 50 +++++++++++++++++++ .../devicetree/bindings/trivial-devices.yaml | 2 - 2 files changed, 50 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml base-commit: 919a83d020a8dfa1411c1dc1cff23a833f0f5268 diff --git a/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml b/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml new file mode 100644 index 000000000000..1df40ee7454a --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/pmbus/infineon,tda38640.yaml @@ -0,0 +1,50 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- + +$id: http://devicetree.org/schemas/hwmon/pmbus/infineon,tda38640.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Infineon TDA38640 Synchronous Buck Regulator with SVID and I2C + +maintainers: + - Naresh Solanki + +description: | + The Infineon TDA38640 is a 40A Single-voltage Synchronous Buck + Regulator with SVID and I2C designed for Industrial use. + + Datasheet: https://www.infineon.com/dgdl/Infineon-TDA38640-0000-DataSheet-v02_04-EN.pdf?fileId=8ac78c8c80027ecd018042f2337f00c9 + +properties: + compatible: + enum: + - infineon,tda38640 + + reg: + maxItems: 1 + + infineon,en-pin-fixed-level: + description: | + Indicates that the chip ENABLE pin is at fixed level or left + unconnected(has internal pull-down). + type: boolean + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + tda38640@40 { + compatible = "infineon,tda38640"; + reg = <0x40>; + }; + }; + diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml index 40bc475ee7e1..86c7d34f63bf 100644 --- a/Documentation/devicetree/bindings/trivial-devices.yaml +++ b/Documentation/devicetree/bindings/trivial-devices.yaml @@ -151,8 +151,6 @@ properties: - infineon,slb9645tt # Infineon SLB9673 I2C TPM 2.0 - infineon,slb9673 - # Infineon TDA38640 Voltage Regulator - - infineon,tda38640 # Infineon TLV493D-A1B6 I2C 3D Magnetic Sensor - infineon,tlv493d-a1b6 # Infineon Multi-phase Digital VR Controller xdpe11280 From patchwork Wed Aug 30 10:36:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Naresh Solanki X-Patchwork-Id: 137182 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:a7d1:0:b0:3f2:4152:657d with SMTP id p17csp4714084vqm; Wed, 30 Aug 2023 11:47:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFdRQGUe76B5R2AzyCOQ3u7THQXOOHxXxapM7qAwQLzTHEjncRrybYfG3nz98uC5mcgzrTA X-Received: by 2002:a17:902:d48e:b0:1bb:1e69:28be with SMTP id c14-20020a170902d48e00b001bb1e6928bemr2702214plg.42.1693421241437; Wed, 30 Aug 2023 11:47:21 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1693421241; cv=none; d=google.com; s=arc-20160816; b=Hj13tYgNV8zxuQnxgvBxixNFyh1LNJE771ndUqciRRgTJhzH//qGmRKiIvIq227o0T KqZOcCY+zaBrcQ2zqv3h+veGxvps/UDenVuh/R4HTxA+5F0ULEjlVWR+9ER0ACwNH9Hs qH/tF8OEBjRsw2jPoi3laJ0sQacaS0Dr9wzJ8JG5On6Sb0JNVYAzpnqFjvX/GRoABKa5 o0Mpfna+uVLItZMOmWW4/hJ+gshc2dLBVgRX2Hm3SVi9RVZ5bZZKJgOoH2/synyGJsqN HUGKRK5eJvBmOZJnrYwkBoGZ0noQdHarnSFMkBxCAwfLsxyvqV0MX+0J4u227ialENSI j9hA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=A4gcF63fe1TKqOf9MhohsxK7SINhHLw9bxgMUJq7sfo=; fh=QJmwr1miahMEKUWg9F3+AhC55DhYUL3pj+4mXUEz0Mg=; b=hrwoF6pYrg4ebjte6VOKsgymjiosfumD+W2BMmdapT3NPiX1EUSUOxffXeCYY7KLV8 PeMEEBELoNhy2W2/M6Hfeznl8vKovr2hlhzKD8PUclZ20tqgpuDdlSp38TsM6Ji/IDqe kkWl45CVAVwhRtlWDU4glo6ER9+VYZRbt1KC5VO5LyiRvIa0mJA8AmK62quBkdmyLexi sO0pDTsoEtUiF/OvatDO1+EXYkm4b18khhoG203BiAgi0Mg4YabCN9ByXIyrhGWlL6QS lrygNZgNfJ4gt+AYpzl2O9JwKCDU8GPOrGIKATRTG1qPZE5enmfqfBifky3SH//ChY/t 8fTg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@9elements.com header.s=google header.b=XcebUdpk; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=9elements.com Received: from out1.vger.email (out1.vger.email. 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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id s11-20020a170906354b00b00992bea2e9d2sm7027620eja.62.2023.08.30.03.36.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Aug 2023 03:36:30 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: Guenter Roeck , Jean Delvare , krzysztof.kozlowski+dt@linaro.org Cc: linux-hwmon@vger.kernel.org, Patrick Rudolph , Naresh Solanki , linux-kernel@vger.kernel.org Subject: [PATCH v4 3/3] hwmon: (pmbus/tda38640) Add workaround for SVID mode Date: Wed, 30 Aug 2023 12:36:18 +0200 Message-ID: <20230830103620.3611761-3-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230830103620.3611761-1-Naresh.Solanki@9elements.com> References: <20230830103620.3611761-1-Naresh.Solanki@9elements.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1775680871622731103 X-GMAIL-MSGID: 1775680871622731103 From: Patrick Rudolph TDA38640 can operate in either PMBus mode or SVID mode. In SVID mode, by design ENABLE pin is the only option for controlling the output rail i.e., ENABLE pin is chained to power good of another reglator & FPGA. In cases where the chip is configured for SVID mode, and the ENABLE pin is set at a fixed level or is left unconnected (with an internal pull-down), while requiring software control, the following workaround is necessary. The workaround utilizes ENABLE pin polarity flipping to control output rail. If property 'infineon,en-pin-fixed-level' is specified then determine if chip is in SVID mode by checking BIT15 of MTP memory offset 0x44 as described in the datasheet. If chip is in SVID mode then apply the workaround by 1. Determine EN pin level 2. Maps BIT7 of OPERATION(01h) to EN_PIN_POLARITY(BIT1) of PB_ON_OFF_CONFIG. Signed-off-by: Patrick Rudolph Signed-off-by: Naresh Solanki ---- Changes in V4: - Update DT property name - Commit message update Changes in V3: - Use dt property to determine if workaround is needed. Changes in V2: - Remove dependency on DT propery, - Runtime determine SVID mode & ENABLE pin level, - Update commit message. --- drivers/hwmon/pmbus/tda38640.c | 154 ++++++++++++++++++++++++++++++++- 1 file changed, 152 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/pmbus/tda38640.c b/drivers/hwmon/pmbus/tda38640.c index 450b0273fb59..c238330d2e6c 100644 --- a/drivers/hwmon/pmbus/tda38640.c +++ b/drivers/hwmon/pmbus/tda38640.c @@ -18,6 +18,127 @@ static const struct regulator_desc __maybe_unused tda38640_reg_desc[] = { PMBUS_REGULATOR("vout", 0), }; +struct tda38640_data { + struct pmbus_driver_info info; + u32 en_pin_lvl; +}; + +#define to_tda38640_data(x) container_of(x, struct tda38640_data, info) + +/* + * Map PB_ON_OFF_CONFIG_POLARITY_HIGH to PB_OPERATION_CONTROL_ON. + */ +static int tda38640_read_byte_data(struct i2c_client *client, int page, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct tda38640_data *data = to_tda38640_data(info); + int ret, on_off_config, enabled; + + if (reg != PMBUS_OPERATION) + return -ENODATA; + + ret = pmbus_read_byte_data(client, page, reg); + if (ret < 0) + return ret; + + on_off_config = pmbus_read_byte_data(client, page, + PMBUS_ON_OFF_CONFIG); + if (on_off_config < 0) + return on_off_config; + + enabled = !!(on_off_config & PB_ON_OFF_CONFIG_POLARITY_HIGH); + + enabled ^= data->en_pin_lvl; + if (enabled) + ret &= ~PB_OPERATION_CONTROL_ON; + else + ret |= PB_OPERATION_CONTROL_ON; + + return ret; +} + +/* + * Map PB_OPERATION_CONTROL_ON to PB_ON_OFF_CONFIG_POLARITY_HIGH. + */ +static int tda38640_write_byte_data(struct i2c_client *client, int page, + int reg, u8 byte) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct tda38640_data *data = to_tda38640_data(info); + int enable, ret; + + if (reg != PMBUS_OPERATION) + return -ENODATA; + + enable = !!(byte & PB_OPERATION_CONTROL_ON); + + byte &= ~PB_OPERATION_CONTROL_ON; + ret = pmbus_write_byte_data(client, page, reg, byte); + if (ret < 0) + return ret; + + enable ^= data->en_pin_lvl; + + return pmbus_update_byte_data(client, page, PMBUS_ON_OFF_CONFIG, + PB_ON_OFF_CONFIG_POLARITY_HIGH, + enable ? 0 : PB_ON_OFF_CONFIG_POLARITY_HIGH); +} + +static int svid_mode(struct i2c_client *client, struct tda38640_data *data) +{ + /* PMBUS_MFR_READ(0xD0) + MTP Address offset */ + u8 write_buf[] = {0xd0, 0x44, 0x00}; + u8 read_buf[2]; + int ret, svid; + bool off, reg_en_pin_pol; + + struct i2c_msg msgs[2] = { + { + .addr = client->addr, + .flags = 0, + .buf = write_buf, + .len = sizeof(write_buf), + }, + { + .addr = client->addr, + .flags = I2C_M_RD, + .buf = read_buf, + .len = sizeof(read_buf), + } + }; + + ret = i2c_transfer(client->adapter, msgs, 2); + if (ret < 0) { + dev_err(&client->dev, "i2c_transfer failed. %d", ret); + return ret; + } + + /* + * 0x44[15] determines PMBus Operating Mode + * If bit is set then it is SVID mode. + */ + svid = !!(read_buf[1] & BIT(7)); + + /* + * Determine EN pin level for use in SVID mode. + * This is done with help of STATUS_BYTE bit 6(OFF) & ON_OFF_CONFIG bit 2(EN pin polarity). + */ + if (svid) { + ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE); + if (ret < 0) + return ret; + off = !!(ret & PB_STATUS_OFF); + + ret = i2c_smbus_read_byte_data(client, PMBUS_ON_OFF_CONFIG); + if (ret < 0) + return ret; + reg_en_pin_pol = !!(ret & PB_ON_OFF_CONFIG_POLARITY_HIGH); + data->en_pin_lvl = off ^ reg_en_pin_pol; + } + + return svid; +} + static struct pmbus_driver_info tda38640_info = { .pages = 1, .format[PSC_VOLTAGE_IN] = linear, @@ -26,7 +147,6 @@ static struct pmbus_driver_info tda38640_info = { .format[PSC_CURRENT_IN] = linear, .format[PSC_POWER] = linear, .format[PSC_TEMPERATURE] = linear, - .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_IIN @@ -41,7 +161,37 @@ static struct pmbus_driver_info tda38640_info = { static int tda38640_probe(struct i2c_client *client) { - return pmbus_do_probe(client, &tda38640_info); + struct tda38640_data *data; + int svid; + + data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + memcpy(&data->info, &tda38640_info, sizeof(tda38640_info)); + + if (IS_ENABLED(CONFIG_SENSORS_TDA38640_REGULATOR) && \ + of_property_read_bool(client->dev.of_node, "infineon,en-pin-fixed-level")) { + svid = svid_mode(client, data); + if (svid < 0) { + dev_err_probe(&client->dev, svid, "Could not determine operating mode."); + return svid; + } + + /* + * Apply ON_OFF_CONFIG workaround as enabling the regulator using the + * OPERATION register doesn't work in SVID mode. + * + * One should configure PMBUS_ON_OFF_CONFIG here, but + * PB_ON_OFF_CONFIG_POWERUP_CONTROL and PB_ON_OFF_CONFIG_EN_PIN_REQ + * are ignored by the device. + * Only PB_ON_OFF_CONFIG_POLARITY_HIGH has an effect. + */ + if (svid) { + data->info.read_byte_data = tda38640_read_byte_data; + data->info.write_byte_data = tda38640_write_byte_data; + } + } + return pmbus_do_probe(client, &data->info); } static const struct i2c_device_id tda38640_id[] = {